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The direct methanol fuel cell (DMFC) is an efficient and non-polluting green energy conversion device. However, the electrocatalysts for the anodic methanol oxidation reaction (MOR) in DMFC are often precious metal catalysts, which suffer from high cost, poor stability, and easy deactivation. In this work, two isostructural metal-organic frameworks (MOFs) [M 3 (μ 3 -OH)(TATB)(Nic) 2 (H 2 O) 2 (DMA)] (M = Co, Ni) were successfully synthesized under solvothermal conditions. Both frameworks possess a unique trinuclear cluster [M 3 (μ 3 -OH)(COO) 5 ] secondary building unit (SBU) and a rare binodal (3,7)-connected network. Due to the high density of metal sites and prominent pore system within CTGU-36-Ni, it can serve as an effective molecular electrocatalyst for MOR, while CTGU-36-Co is an inert material. Further experimental results showed that the introduction of conductive substances could lead to a significant increase in the MOR area activity of CTGU-36-Ni. This work not only provides a non-noble metal molecular MOR electrocatalyst but also opens a new vision for the design and application of crystalline materials in various energy conversion processes. Two isostructural metal-organic frameworks (MOFs) with atypical trinuclear cluster have been constructed successfully, which exhibit good electrocatalytic properties toward methanol oxidation reaction as molecular electrocatalysts or after the addition of conductive carbon mediums. [Display omitted] • Two isostructural MOFs with atypical trinuclear cluster have been constructed. • CTGU-36-Ni and its composites exhibit remarkable electrocatalytic activity for MOR. • This work provides a molecular MOR catalyst and a new vision for the application of MOFs. [ABSTRACT FROM AUTHOR]

For the first time, sodium caprylate has been investigated to direct the crystal growth of 3D Ag-MOF, [Ag 2 (ddcba)(4,4′-bipy) 2 ] ( 1 ), constructing from 3,5-(di(2′,5′-dicarboxylphenyl)benozoic acid and 4,4′-bipy. The single crystal diffraction analyses shows that complex 1 possess 3D neutral framework with a three-connected ThSi 2 (10 3 -b) topology. Compound 1 exhibits predominant catalytic activity towards the degradation of o- Nitrophenol (ONP), m- Nitrophenol (MNP) and p- Nitrophenol (PNP) in aqueous solution. The kinetics of such catalytic degradation reactions was also studied. [ABSTRACT FROM AUTHOR]

Co-BDC/Ti 3 C 2 T x hybrid nanosheets with rich bridging bonds and tight contact interface were in-situ fabricated via a simple two-step approach including solvothermal reaction and low-temperature annealing, which ensure the high overall conductivity and reactivity as well as stability, and hence bring improved electrochemical performance to HSC. [Display omitted] The design and synthesis of high-performance metal–organic frameworks (MOFs)-based electrodes are important for hybrid supercapacitors (HSC). Herein, enhanced interfacial interaction in Co-BDC/Ti 3 C 2 T x (denoted as CoTC) hybrid nanosheets is achieved through thermal treatment, giving remarkably improved capacity performance compared with CoTC. The low temperature annealing treatment enables modulation of the bridging bonds content of CoTC and thus regulates the interfacial coupling effect between Co-BDC and Ti 3 C 2 T x. Moreover, both the detailed XPS and XANES analysis reveal that the strong interfacial interactions between the two components promote a partial electron transfer from Ti 3 C 2 T x to Co-BDC through the Ti-O-Co interfacial bonds. Consequently, it endows the Co-BDC with enhanced conductivity as well as the higher valence of Ti species in Ti 3 C 2 T x , hence contributes a remarkable enhanced specific capacity. This work will provide a pathway to design advanced MOF/MXene materials for HSC. [ABSTRACT FROM AUTHOR]

Integrating metal-organic frameworks (MOFs) with transition hydroxides has the potential to enhance the inadequate electronic conductivity and address the slow diffusion of MOF materials in electrochemical applications. Herein, we synthesized a 2D Cu-MOF and successfully prepared a Cu-MOF@Co(OH) 2 heterostructure using a one-step hydrothermal method on a Co(OH) 2 /NF (nickel foam) substrate. The hybrid Cu-MOF@Co(OH) 2 material exhibits high electrochemical reactivity, resulting in enhanced pseudocapacitor performance, with a specific capacitance of 2039.8 mF cm−2 at a current density of 1.0 mA cm−2. In addition, an asymmetric two-electrode cell was constructed using Cu-MOF@Co(OH) 2 /NF and activated carbon (AC)/NF, exhibiting a specific capacitance of 444.5 mF cm−2 at a current density of 1.0 mA cm−2, and demonstrating decent cycling durability with 90.1 % retention after 2000 cycles. One 2D Cu-MOF with MOF-110 analogs has been obtained and crystallographically characterized. The Cu-MOF@Co(OH) 2 heterostructure acted as asymmetric supercapacitor electrode material, which delivered enhance pseudocapacitor performance. Besides, the asymmetric two-electrode Cu-MOF@Co(OH) 2 //AC devices possessed the good specific capacitance and cycling durability. [Display omitted] • One 2D Cu-MOF with MOF-110 analogs has been synthesized and crystallographically characterized. • The Cu-MOF@Co(OH) 2 hybrid material has been fabricated, characterized and showed enhanced pseudocapacitor performance. • The asymmetric two-electrode Cu-MOF@Co(OH) 2 //AC devices possessed the good specific capacitance and cycling durability. [ABSTRACT FROM AUTHOR]

Four new isostructural coordination polymers, [M 2 (μ 2 -H 2 O)(DTBC) 2 ] (CTGU- 26(M), M ​= ​Zn, Cd, Co and Ni] have been prepared with a new butterfly-typed nitroheterocyclic 4,6-di- 1H-1,2,4-triazol-1-yi-1,3-benzenedicarboxylic acid(H 2 DTBC) ligand and metal salts under hydrothermal condition. CTGU-26(Zn) features an unusual 2-nodal (4, 8)-connected scu topological network generated by [Zn 2 (μ 2 -H 2 O)(COO) 4 ] units and DTBC2− anion linkers. Luminescent properties measurements indicate that both CTGU-26(Zn) and CTGU-26(Cd) show intense fluorescence-emission compared with free H 2 DTBC ligand in solid state. Moreover, the electrocatalytic activities of CTGU-26(Co) and CTGU-26(Ni) towards methanol oxidation reaction (MOR) of two compounds were also investigated. Remarkably, by combining each MOF with the conductive 2,3,6,7,10,11-hexahydroxytriphenylene(HHTP) additive, a composite material, HHTP/CTGU-26(Ni)–I was confirmed to have an excellent performance for MOR with a high mass specific peak current of 25.55 ​mA ​cm−2. Four new isostructural coordination polymers, [M 2 (μ 2 -H 2 O)(DTBC) 2 ] (CTGU-26(M), M ​= ​Zn, Cd, Co and Ni] have been prepared with one new butterfly-typed nitroheterocyclic carboxylate ligand was prepared and characterized. And the luminescent properties and methanol oxidation reaction were also discussed. [Display omitted] • Four new isostructural coordination polymers have been prepared with a new butterfly-typed nitroheterocyclic carboxylic acid. • They feature an unusual 2-nodal (4,8)-connected scu topological network generated by binuclear units and DTBC2− anion linkers. • The luminescent properties and the electrocatalytic MOR activities of four complexes has been studied and discussed. [ABSTRACT FROM AUTHOR]